Automatic regulating device for hydraulic elevators.



No. 635,775. Patented Oct. 3|, 1899. F. E. HERDMAN. AUTOMATIC REGULATING DEVICE FOR HYDRAULIC ELEVATORS.

{Application filed Jun 28', 1597.) m Now) 5 shmi-sumf g x k l; fi k A inventor.

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, m2. nEnomA-n. 7 AUTOMATIC BEGULATING DEVICE FOR HYDRAULIC ELEVATBBS.

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Aptqr xij y Witnesses.

, Attorney.

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Inventor. Q

Patented Oct. 3|, I899. F. E. HERDMAN. UTOHATIG BEGULATING DEVICE FOR HYDRAULIC ELEVATORS.

(Application mm ha. 2; 'lm.

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F. E. HERDIIAN.

AUTOMATIC BEGULATINB DEVICE FOR HYDRAULIC ELEVATORS.

(Application Med Jan 3 1891.) N0 IIB IBIJ 5 Shula-Slut 4.-

Inventor.

' ""ffi Np. 635,775. v

Patented Oct. 3|, $99.;

F. E. HEBHHAN.

AUTOEATE BEGULATiNG DEVICE FOR HYDRAULIC ELEVATORS.

(Applicstion mod aaksa, 1091. I (Flo lodol.) 5 $haoh8hut 6. Y

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VVit-nesses.

Attorney.

"they .between that required for the load and that UNITED STATES PATENT OFFICE.

FRANK E. HERDMAN, OF WINNETKA, ILLINOIS.

AUTOATIC REGULATENG DEVBCE FOR HYDRAULIC ELEVATORS.-

srnomennon forming part 6: Letters latcnt so, seems, dated October 31-, less.

Ap l mtinn filed January 28, 1897.

To all whom it may concern:

Be it known that I, FRANK-E. HERDMAN, it citizen of the United States, residing at Winnetkn, county of Cook, and State of Illinois, have invented a newnnd useful Improvement in Automatic Regulating Devices for Hydraulic Elevators, of which the following is s full, clear, and exact description, reference be ing had to theaccompsuying drawings, which form a part of this specification.

With hydraulic elevators the speed of the car varies according to the load in the car. \Vith one condition oi load the full pressure is required to move the car, and as a result a slight friction in the valve and passage is sufiicient to prod rice as slow speed. If the condition of load is such as to require only a, light pressure, then the difference of pressure at the source of pressure is consumed in overcoming the friction,therebyproducingexcess ive speed. This variation exists also when the elevator or. operating cylinder is cut elf from the pressure-supply and opened to the outlet. I

The object of my invention is to provide 2. speed-regulator which, governed by the pressure in the elevator or operating cylinder, will control the admission to and discharge from said cylinder, so that a uniform speed with a varying 10nd may he obtained, endto do this without interfering with the control of stopping and starting by the operating-valve.

To that end my invention, broadly considered, consists in combining with the eleva torcyliuder, having a source of water-supplyaud an inlet from the source of supply to the cylinder and an outlet from the cylinder, 3. device adapted to regulate the inflow of water to the cylinder and ai'egulatingdevice for-regulating the out flow of water from the cylinder. Either or both of these two devices maybe used'and are controlled by it pressure device whose action depends upon the pressure in the operating or elevator cylinder. The regulating device interposed between the elevator-cylinder and theinlct and outlet is independent of the ordinary regulating-valve, which is used to connectthe cylinder with the outlet, both the-ordinary regulating-valve and this additional regulating device controlling the nd- Serial E's. 920,323; (Ho model.)

mission to and exhaust from the cylinder at the same point.

In the preferred form of embodiment of this i I invention: broadly considered, I interpose between the cylinder and the inlet or the cylin derand the outlet, or both, a. perforated dialphrngrmwhich is partially covered by ashield, which shield is adapted to move upon the diaphragm with reference to the inlet toeut oiI or cover the disphragm-pcrforati'ons at the 1 4 A 4- inlet end er in) epen them, and the same with,

reference to the outlecope'nin'gs in the direphragm. This shield is connected with a pressure device controlled by the pressure in i the elevator-cylinder, so that the tendency-to' variations in pressure in the cylinder .will

move the shield to regulate the inlet or outlet,

'the operating vnlve coacting with the perforated diaphragm on one side and the shield coacting with it on the other side. The proferred form of pressure device that I use isa piston the cylinder of which is connected with the elevator cyliud er, the piston having a.

spring against which the pressure from the elevator or operating cylinder upon the piston sets. This spriu g is so regulated thntwith the proper pressure (to give the desired speed) a given load will not nllfect or more the piston,

and the shieldis so formed and is placed in ,proper speed in either ascending or descending with this load, and the variation of load will cause a variation in the movements of the'piston through the variation of pressure in the elevator-cylinder and move the shield to cover or uncover the'perlorations of the diaphragm to regulate the supply or outlet to conform to the changed condition and maintnin the speed constant.

I have illustrated my invention as applied to a hydraulic elevator of the plunger type 5 where thew-eight of the plunger descending lifts the load, the valve to the cylinder being open' to discharge under that condition. hen the car is descending, this plunger must be lifted, and at such times the operatzoo ing-vslve is moved to open the supply to the cylinder. Vv'hile my description will be up desired under these conditions.

plied to this plunger type of machine, yet the i B is the operating-valve in chamber B.

same mechanism is applicable to all types of hydraulic machinery where different loads are n oved, aud I desire to haveit understood that my invention is not limited to use with any particular type of hydraulic elevators.

In the drawings, Figure 1 is a side elevation of the valve mechanism. Fig. 2 is a section on the line a: a; of Fig. 1. Fig. 3 is a section on the line y y of Fig. 1. 'Fig. 4 is a section on the line 1r w of Fig.3. Fig. Sis a diagram of the bushing E and the shield 11 cut and spread on a plane. Fig. 6 is a section on the line 2; z of Fig. Fig. 7 is-a section as on the line it u of Fig; 4. Fig. 8 is a side elevation of elevator and attachments.

In the plungermachine when ascending with a light load there is necessarily a sur plus weight in favor of the plun'ger,.and in consequence this surplus weight is taken up, forcing the water out of the cylinder. It the car is heavily loaded in ascending, then the surplus weight is against the plunger, and in consequence there is less force available to force the water out of the cylinder. If under such circumstances the valves and piping were designed to give a proper speed with a heavy load, then with a light load the speed would be excessive unless some mechanism were used to create a resistance to the discharge of the water. The amount of this resistance depends entirely upon the speed If the car is descending with a light load, thenthe valve is open to the supply, and if the pipes are designed for the proper speed under such circumstances itwould require the full pressu re of the supply to give this speed, as the ex cessive weight of the plunger has to he lifted,- while if the car is descending with a heavy load there is much less weight of the plunger to be lifted, and in consequence less pressure required to lift the plunger. difference of this pressure and the pressure of the supply would give a great velocity to the flow of the water and corresponding excessive speed to the plunger under these conditions. If the car is ascending with a light load and the discharge-port is sufficiently choked, the speed can be limited to the desired amount, and when descending with a heavy load if the supply-port is properly choked the speed can be limited to the desired amount. The diilicuity in choking such ports is that itis likely to give a short choppy movement to the valve, which gives a sudden stop to the car. 'lhcautomatic deviceshcreinafter described are arranged so that while they choke the inlet and outlet ports still they do notin any way interfere with the graduated cut-oft of the operating-valve, its action on the speed being thrcughontits full travel the same as before.

A is the inlet or supply port connecting through the operating-valve chamber ll and mechanism to be hereinafter described with the elevator or operating cylinder (9.

As a result the D is the outlet-port.

b b are the valve-heads on' the valve B. (Shown inFig. 3 at the central position.) This valve is controlled and moved by means of the piston-heads b L", which are brought in connection with water or fluid through the medium of the valve D, having the inlet-port d and the passage (1' leading to the operatingvalve chamber of the valve B on the head side b while the passage cl leads to the other side-40 wit, the head b"while the passage d leads to the exhaust D. This valve D is 'u nd'er'the control of the operator, andby the greater amount off at the start, and as it p nears the final cut-otf doing 'so gradually to prevent any noticeable shock in the car.

G G are two rings connected together and threaded on the inside. In each ring is placed 5.) These sleeves or jackets II are adjustablcin the rings G G and are held from slipping by sct-screws g and are curved to cona sleeve or jacket H-. (Shown in detail, Fig.

form to the graduation of the perforations,

being, like the perforations, brought up tea point. From this construction when either sleeve or jacket is moved to choke the perforations at its end it does so on all sides at once, with the except-ion of the apex of the perforations, which it will only partially in terfere with. Such being the case, if either sleeve is thrown over the perforations at its end it leaves the remaining perforations so graduated that the operating-valve piston has to have its full travel to fully cut olf the water, and so that the operating-valve in moving to admit or cut off the water will always solely control a portion of the inlet, so thatit will be able to out olf for a stop without delay and gradually. The rings G G are carried by a rocker I, connected with a lever J on the outside of the valve. conuectcd'with the piston-rod K in the cylinder L. The cylinder L is connected with the elcva-tor-cylindcrC by the pipe Ill. In the cylinder-L is the spring L, opposing the action of the pressure from cylinder C.

The operating-val ve has a movement so that either port A or port D is brought into conncction with port 0, leadingto elevator-cylindcr C, the valve being shown in Fig. 3 in a horizontal position. The operating-valve has a movement so that port A or port D is connected with the port 0 through half only of the perforations. The spriu g L is of strength snfiicient to prevent the movement of the piston-rod K with the minimum desired pressure The lever J is in the elevator or operating cylinder. The plates orjackeis are arrangcdin such position, as shown, to leave open the proper number of perforations in the inlet and exhaust portion of the jacket. Underthese conditions that is, the passage of the supply to the cylinder when the operating-valve is open would be choked whiie in this position if the valvewere turned to connect with the exhaust ordischarge-the f ullcst number of perforations correspondingto the exhaust would he opened. If under these conditions, say, the elevator is ascending with a heavy load, the weight on the side of the plunger ovcr'oalancing the elevator would he at a minimum, and in consequence the least amount of weight would be used in forcing the-water on t of the discharge. In such case the discharge should be perfectly free. If, on the other hand, the car is going down with a full load, the excessive weight on the side of the plunger would be still at a minimum, and in consequence a small amounrhof pressure would he required to lift the plunger. Such being the case, the supply-port should These conditions exist as shown in Figs. 3,4, and 5. If ascending with a light load, then the excessive weight on the side of the plunger would tend to force the water out of the cylinder Lil withgreat velocity. The excessive weight of plunger produces an excessive back pressure in the cylinder, and this back pressure necessarily compresses the spring L and moves the lever J, so as to cause the shield H to choke the perforations between the port D and C,

thereby producing an extreme rcsistancc to this discharge and preventing an excessive speed. 0n the other hand, if descending with a light load this excessive weight. on the side of the plunger will have to he lifted, requiring the full water-pressure to do so. Such being the case, a free passage of the water through the supply would be necessary to give the proper speed. Under such conditions of load thefull pressure would he felt in the cylinder, and in consequence the spring L would be compressed to that amount. Such compression would move the shield H, so as to give the full opening of the perforations between the supply-port A and the operatingcylinder. This meets the desired conditions in this respect. All other conditions of load 'are between these two, and the perforations should be proportionately opened or closed, and this would necessarily be produced by the pressure in the cylinder acting on the spring L.

In Fi 8 I have shown the device shown in the other figures connected with the elevatorcylindcr, the car, and its appurtenant mechanism. Inthis drawing, (3 is the operating cylinder, in which works the plunger 37, on the top of which are the weights 2?. 0 is the traveling sheave carried by and moving with the plunger. 'lhc liiling-cahlc l is attached at one end to the lixcd point 1), passes .aroui-ldthe traveling sheave O, thence over the sheave O O to the elevator-car Q. R is the operating -e:rhlc, which passes around the sheaves r r', through the car around the sheave 2- at he bottom around the sheave 1*, which is connected with the rock-shaft 1!, which rock-shaft is in connection with the operating-valve I).

As may be seen from the foregoing, in elevating .mcchauiszn'constructed so as to om-, body my invention the flow of water to and from the elevator-cylinder is regulated dependent upon the pressure in the elev. torcylindcr itself, so that the flow to and from conforms to the requirements. Further, this is accomplished without in any way detracting from the operation and effect of tho ordinary operating-valve;

The operating-valve of. a hydraulic elevator is an important pieceof mechanism, particular where the elevator is ahigh-speedelevator. This valve must be adjusted so as.

to cut oil the flow of 'water gradually, or

otherwise under certain conditions the effect upon the car would. he injurious and disagreeable toshe passengers in the car. Thus if the valve isshut olf qu icklyorsuddenly with the high -spc2d elevator there would 'be a tendency for the car to jerk or jump, which ,is vcr objectionable. When ascending light, with the valve wide open, the water would be forced through the discharge with great ve locity due to the weight of the unbalanced plunger, and the car would have great speed. The valve must be adjusted for this extreme, so that when stopping there shall be no jump or jerk-that is, it must beadjusted to out H off gradually. Asa reverse case,when ascending with a heavy load with the same adjustment the movement of the valve when stop plug will be liable to he too slow. For this reason it is very desirable to use mechanism 7. c

which will regulate the flow of the water to and from the elevator dependent upon the weight in the car, and thus maintain asubstantially constant speed of travel for the car. I This being accomplished with' one adjustment of eperating-valve, or rather one adjustment of the gradnations of cutting off the supply of water, the valve will operate with ny weight of car, as the car always maintaining substantially the same speed indcpendento the load one adj ustmcnt for the stop will be. :m adjuslmentf r all conditions. Where this pressure-regulating device is placed in the pipe or connection leading from the operating-valve to the elevator-cylinder at a point hc-f md the control of the operatingvalve, while the inlet and discharge of the a consequence if the operating -valve be thrown fully open the water-will pass to this pipe or connection without any restriction. Under these conditions if the operator desires to stop before any effect can be obtained from the movement of the operating-valve it is necessary for it to move a distance sufiicient to always ready to respondat once to their full 76 capacity. It further may be expressed by the fact that the operating-valve and the regulating device move to contract the connection at close the inlet orconucction atthe point where the operating-valve is placed an amount equal to the extent of closure at the point where the regulating device is placed. Therefore under these conditions before the elevator can commence to stop the operating-valve has to move over this distance, and therefore will have to do all its action to cut ofi in the short space left, and to do this will give' such a. slow travel to the valve in its whole travel that the operator has not good control of the car. Practi-- cally the operation is through the pressure regulating device to contract the connection to the elevatoncylinder at its opening intothe valve-chest proportionately throughout. its cut-ire extent, thus, as'it were, contracting the part controlled by the valve throughout the entire length of travel of the valve, contreating it proportionately throughout the entire length. in c n equence a all i s the an angle to each other.

Having now fully described my invention,- what I claim, and desire to protect by Letters Patent, isi -1. In a hydraulic elevator, in combination, an elevato r-cylinder,a source of water-supply,- an, inlet from the source of water-supply to the cylinder, an outlet from the cylinder, an operating-valve adapted to control said inlet and outlet, a regulating device interposed be tween the cylinder and the inlet and outlet and adapted to regulate the inlet to and outlet from the cylinder, at pressuredevice controlled by the pressure in the cylinder, and connection between said pressure device and the regulating device whereby the action of said last-mentioned device is controlled by the pressure in the cylinder.

2. In a hydraulic elevator, in combination, an eleva -cylinder,aso w 'er-supply,

an inlet from the source of water-supply to the cylinder, an outlet from the cylinder, a. 95. regulating device interposed between the cylindcr and the inlet and outlet and adapted to rcgulate'the inlet to and outlet from the cylinder, a spring or weighted piston the cylinder of which is in connection with the elevazoo tor-cylinder, and connection between said inlet and outlet waiter-regulating device and said piston whereby the movement of said piston controls the movement of said regulating device. v

3. In a hydraulic elevator, in combination, an elevator-cylinder,a source of water-supply, an inlet from the source of water-supply to the cylinder, an outlet from the cylinder, 3. regulating device interposed between the cyl- IO inder and the inlet and outlet and adapted to regulate the inlet to and exhaust from the cylinder, a pressure device controlled by the pressure in the cylinder, and connection between said pressure device and the regulating 1 15 device whereby the action of said last-mentioned device is controlled by the pressure in the cylinder, auopcrating-valve operating in dependently of the regulating device, and means independent of the regulating-device- 12o controlling mechanism, to control said oper- Ming-valve.

i. In a hydraulic elevator, in combination, an clevutor-cylinder,a source of water -supply, an inlet from the source of water-supply to the cylinder, an outletfrom the cylinder, a regulating device interposed between the cylinder and the inlet and outlet and adapted to regulate the inlet to and outlet from the cylinder, a spring or weighted piston the cylin- 13o der of which is in connection with the eleva tor-cylinder, connection between said regulating device and said piston whereby the movement oi said piston controls the move operating-valve has immediate and prompt effect on the action of the car, and it responds at once. If this opening is choked or'contracted greatly to prevent excessive speed, it is done proportionately throughout the entire movement of the valve, -and in consequence as soon as the valve commences to close the car commences to respond. .This gives the operator perfect control of the elevator and much more rapid movement of the valve. Speaking generally, it may be seen hat the apparatus operates to accomplish this by reason of having an inlet from the source of wa tor-supply to the cylinder, an operating-valve adapted to open and close saidv inlet, a regulating-valve adapted to vary the size of said inlet, and a pressure device controlled by the pressure in the elevator-cylinder, and connection between thepressure device and the regulating-valve, whereby the act-ion of the regu lating device is controlled by the pressure in the elevator-cylinder. This may be stated to be the idea in its broadest sense, with the uuderstanding that of course it is equally applicable to the outlet from the cylinder to the discharge. More narrowly, it consists in controlling the connection between the operatingvalvc cylinderor casing and the elevator-cylinder by means of both an operating-valve and a regulating device, the movement of the regulating device being con trolled by the pressure in the elevator-cylinder, both the operating-valve and the regulating device acting to regulate the size of the connection between the valve cylinder or case and the elevatorcylinder, there being, however, a portion of said connection which is controlled entirely by the valve from its initial movement to its ultimate position It may further be expressed by the same construction of parts where they both move in opposite directions men tof said regulating device, an operating valve operating independently of the regulat-ing device, and means independent of the regulating-device-coutrolling mechanism, to control said operating-valve.

5. in a hydraulic elevator, in combination, an elevato ylindcna source of watersupply, an inlet frond the source of water-supply to the cylinder, an outlet from the cylinder, :1. regulating device interposed between the cylinder and the inlet and utlet adapted in its movement to cut oil and open gradually the inlet to and exhaust from the cylinder but not to close said inlet and outlet completely, a pressure device directly controlled by the pressure in the cylinder, and connect-ion be tween said pressure device and the regulating device whereby the action of said last mentioned device is controlled by no pressure in the cylinder.

6. In a hyd raulic elevator, in combination, an ele vator-cylind er, a source of water-Sn pply, an inlet from the source of water-supply to the cylinder, a diaphragm having at different points varying opening capacity interposed between the elevator-cylinderaud inlet, shield controlling said openings but of such size as at no time to cover all of said openings, a prcssu reo'egulatin g device controlled by the pressure in the elevator-cylinder, and connection between said prcssu re devic and the shield whereby the action of the shield is controlled by said pressure device. 4

7. In a hydraulic elevr or, in combination, an elcvatoncylindena source of water-supply, an inlet from the source of water-supply to the cylinder, and an outlet from the cylinder, a diaphragm having at different points varying openingcapacity interposed bet-ween the elevator-cylinder and inlet and outlet, a shield controlling said openings but of such size as at no time to cover all of said openings, 31. pressu re-regulating device controlledbythe pressure in the cylinder, and connection between su id shield and the prcssn re-regulatin g device whereby said pressureregulating device controls the movementof sa d shield.

' S. In a hydraulic elevator, in combination, an elevator-cylinder,a sou rec of watersupply, an outlet from the elevator-cylinder, 2. diaphragm having at diiierent points varying opening capacity interposed between the elevator-cylinder and outlet, a shield controlling said openings out of such size as at no time to cover all of said openings, a pressure-regulating device controlled by the pressure in the elera-tor-cyli nder, and connection between said pressure device and the shield whereby the action of the shield is cont-rolled by said. pressure device.

9. In a hydraulic elevator, in combination, an elevator-cylindeiga source of water-supply, an inlet from the source of water-supply to the cyliu ..cr, a diaphragm having gradually-decreasing opening capacity at different points in terposcd bet-ween the elevator-cylinder and inlet, a shield controlling said openings but of such size as at no time to cover all of said openings, a prcssu're-regulatingde vice controlled by-the pressu e in the elevatorcylinder, and connection between said pressure device and the shield whereby the action of the shield is controlled by said pressure device.

10. In a hydraulic elevator, in combination, an elevator-cylinder, a source of watersupply, an inlet from the source of water-supply to the cylinder, and an outlet from the cylinder, a diaphragm having gradually-decreasing opcning capacity at different points interposed between the elevator-cylinder and inlet and oullct,ashield controlling said openings but of such size as at no time to cover all of said openings, :1 pressure-regulating de vice controlled by the pressure in the cyliu der, and connection between said shie? i and the pressure-regulating device whereby said pressure-regulating device controls the movement of said shield.

11. In a hydraulic elevator, in combination, an elevator-cylinder, a source of watersnpply, an outlet from the elevator-cylinder, a diaphragm having graduallydecreasing opening capacity at different points, iuterposed between the elevator-cylinder and out let, a shield controlling said openings but of ings, a pressure-regulating device controlled such size as at no time to cover all of said openby the pressure in the elevator-cylinder, and

connection between said pressure device and the shield whereby the action of the shield is controlled by said pressure device.

' 12. In a hydraulic elevator,,1n comhirntlion, an elevator-cylinder, a source'of watersu p pl y, an inlet from the sou rce of Water-sup ,ply to the cylinder, a diaphragm having perforations arranged in tapering form inter po'sed between the elevator-cylinder and inlet, a tapered shield controlling said perforations but of such size as'at no time to cover all of said perforations, a pressure-regulating device controlled by the pressure in the elevator-cylinder, and connection between said pressure device and the shield whereby the action of the shield is controlled by said pressure device.

13. In a hydraulic elevator, in combination, an elevator-cylinder, a source of watersupply, an inlet from the source of Water-supply to the cylinder, and an outlet from the loo" cylinder, a diaphragm having perforations arranged in taperin g form interposed between the elevator-cylinder and inlet and outlet, a

tapered shield controlling said perforations but of such size as at no time to cover all of said perforations, a pressure-regulating device controlled by the pressure in the cylinder, and connection between said shield and the pressure-regulating device whereby said pressure-regulating device controls the movement of said shield.

14. In a hydraulic elevator, in combination, an elevator-cylinder, a source of watersnpply, an outlet from the elevator-cylinder,

' ply ie the cylinder, an operating-valve, :1 cyla diaphragm havihig perforations arranged in tapering l'orm interposed between the elevator-cylinder and outlet, a tapered shield eon-r trolling said perforations but of such size as at. no time to cover all of said perforations, a pressure-rcgulating device controlled by the pressure in the elevator-cylinder, and c onnec tion between said pressure device and the shield whereby the action of the shield is controlled by said pressure device.

15. In a. hydraulic elevator, in combination, an elevator-cylinder, a source of watersupply, an i nlet from the source of water-s11 pply to the cylinder, an outlet. from the cylinder, a diaph ragm having openings interposed between the inlet. to and outlet from the cylinder, and a shield adapted in its movements to cover and uncover the openings in said diaphragm, a, pressure device directly controlled by the pressure in the elevator-cylinder, and connection between said pressure device and said shield wherel) the movement of said shield is controlled by the pressure device.

16. In a hydraulic elevator, in combination, an clevaioncylinder, a source of watcrsupply, an inlet from thesource of watcnsup ply to the cylinder, an outlet from i-he cylinder, an operating-valve, a. diaphragm having openings placed in the operating-valve, and a shield adapted in its movem'ents to cover and uncover the openings in said diaphragm, a spring or weighted piston, the cylinder of which is in direct; connection with the elevator-cylinder, and connection between said shield and said piston \vlicrebythe movement, 'of said piston controls the movement of said regulating device.

17. In a hydraulic elevator, in combination, an elevator-cylinder, a source of watersupply, an inlet; from the source of water-supply to the cylinder, an outlet from the cylinder, an operating-valve,a diaphragm having openings placed.in the operating-valve, and a shield adapted in its movements to cover and uncover the openings in said diaphragm, aspring or weighted piston the cylinder of which is in connection with the clevator-cylinder, and connection between said shield and said piston whereby the movement of said pis ton controls the moveinentof said regulating device.

18. In a hydraulic elevator, in combinalion, an elevator-cylinder, a source of watersupply, an inlet from the source of water-supindcr having openings placed in the valve, ashield on the exterior-of ihc cylinder adapted in its movement to cover and uncover said openings, a pressure-regulating device controlled by the prcssu re in the elevator-cylin-- der, and connection between said pressure device and the shield whereby iheaction of the shield is controlled by said pressure device.

19, In a. hydraulic elevator, in combina tion, an clcvatoi eylinder, a source of water supply, an inlet from the source of water-supshield and the pressure-regulating device whereby said pressure-regulating device controls the movement of said shield.

20. In a" hydraulic elevator, in combination, an elevator-cylinder, a source of waterin the cylinder, and connection between said supply, aninlet, from the source ol' water-supply to the elevator-cylinder,- and an outlet from said cylinder, a diaphragm interposed between the cylinder and inlet and outlet,

sponding to the elevator-cylinder inlet and outlet, a shield for said diaphragm, adapted in its movement; in one direction to cover the outlet-openings and uncover the inlet, and vice versa int-he otherdirection, a pressuresaid diaphragm having perforations corroregulating device operated by the pressure in the elevator-cylinder, and connection between the pressu re-regulating device and the shield whereby the movement of the shield is com trolled bythe pressured-regulating device.

21. In a hydraulic elevator, in combination, an elevator-eylinder, a source of watersupply, an inlet from the source of water-suptor-cylinder, a cylinder interposed between the elevator-cylinder and the inlet and outlet, said cylinder having perforations opposite the inlet and outlet,'a shield having a cut-away central portion andodapted in its movement; in one direction to move over the inlet; 1-forat-ions and uncoverthe outlet-openings, and vice versaiu the other direction, a spring or weighted piston, a cylinder in which said piston works, said cylinder being in connection with the elevator-cylinder, and connection between said shield and said piston, whereby the movement of said piston controls the movement of said shield.

22. In a hydraulic elevator, in combination, an elevator-cylinder, a source of watersupply, an inlet from the source of water-sup ply toihe elevator-cylinder, and an outlet from said cylinder, a diaphragm interposed between the cylinder and inlet and outlet, said diaphragm having openings corresponding to the elevator-cylinder inlet and outlet, a shield for said diaphragm, adapted in its movement; in one direction to cover the outlet-openings and uncover the inlet, and v1ce versa in the otherdirection, a spring or weight; ed piston, a. cylinder in which said piston works, said cylinder being in connection with the elevator-cylinder and connection between said shield and said piston whereby the movesaid shield.

ply to the cylinder, snout-let from the ele- 23. In a hydraulic elevator, in combiuaply to the cylinder, an outlet, from the elevalion, an elevator-cylinder, a port in connection with the cylinder, an operating-valve adapted to open and close said port, a. regulatiug device adapted to vary the size of said port, a pressure device controlled by the pressure in the elevator-cylinder, oud connection between the pressure device and the regulatlug: device, whereby the action of the regulating device is cont-rolled by the pressure in the elevator-cylinder.

24. In a hydraulic elevator, in combination, on elevator-cylinder, a port in councction with the cylinder, an opernting-valve adapted to open and close said port, a reguluring device adapted to open and close a por lion only of said port, another-portion of said port being controlled solely by said opcrnt hag-valve rout its initial to its ultimate positiou, a prcssn re device controlled by the pressure in the elevator-cylinder, and connection hetween the pressure device and tho rcgnlnb ing device, whereby the action of the regulasting device is controlled by the pressure in the elevator-cylinder.

25. In a hydraulic elevator, in combination, on elevator-cylinder, a. port in connection with said cylinder, an operating-valve adopted in its movement to open and close said port, a regulating dcvicc adapted to move in opposite directions respectively to the operating-valve to partially open and close-said port, a pressure device controlled by the pressure in the elevator-cylinder, and connection between the pressure device and the regulatlug device whereby the notion of the regulating device is controlled hythe pressure in the elevator-cylinder.

26. in a hydraulic elevator, in combination, an elevntorwylinder, a port in connection with said cylinder, an operating-valve adapted by its movement in opposite direc-' tions to open and close said port-,2. regulating device adapted to partially open and close said port, the operating-valve moving in one direction and the regulating-valve in an opposite direction to close said port, a pressure device controlled by the pressure in the elerotor-cylinder, and connection bet-ween the pressure device and the regulating device, whereby the action 0: the regulating device is controlled by the pressure in the elevatorcylinder.

27. In it hydraulic elevator, in combination, nu elevator-cylinder, a. source of water supply, an iulct-portfrom the source of Watersupply to the cylinder, an outlet-port from the cylinder, an operating-valve adapted to open and close said inlet: and outlet ports, a regulating device adapted to vary the size of said inlet and outletports, n. pressure device controlled by the pressure in the cylinder, and connection between said pressure device and the rcgulut ing device whereby the action of the regulating device is controlled by the pressure in the cylinder. I p

' 28, In a hydraulic elevator, in combination, elevator-cylinder, a source of watersupply, an inlet from the source of watersupply to the cylinder; an outlet from the cylinder, operating-valves adapted to open and close said inlet and outletga regulating device adapted to open and close a portion of said inlet and outlet, the other portion of said inlet and outlet being controlled solely by said operating-valve from its central to its opposite ultimate positions respectively, a pressure device cont-rolled by the pressure in the cylinder,-nnd connection between saidpressure device-and the regulating device whereby the action of the re ulating device is controlled by the pressure 1n the cylinder.

29. In a hydraulic elevator, in combination, on elm'ator-cylinder, a source of watersupply, an inlet from the source of watersupply to the cylinder, an outlet from the cyliudcnan operating-valve adapted in its movement from its center in one direction to open the inlet, and vice versa, and in its movement i no its ceutcrin the other direclatiug device adapted to move in opposite directions respectively to the operating-valve let, a pressure devicecont-rolled by the pressure in the cylinder, and connection between said pressure device and the regulating device whereby the action o the regulating deinder.

30. In a hydraulic elevator, in combinatioii, an elevator-cylinder, a source of watersupply, an inlet from the source of.wa.tersupply to the cylinder, an outlet from the cylinder, an operating-valve adapted by its movementin opposite directions on either side of its central position to open and close said inlet and outlet, n regulating devic'o adapted to partially open and close said inlet nud outlet at an angle to the direction in which said inlet and outlet is opened and closed by the movement of the operatingvalvc, a pressure device controlled by the pressure in the cylinder, and connection be tween said pressure device and the regulnb inc: device whereby the'actiou of the regulating device is controlled by the pressure in the cylinder.

tion, an elevator-cylinder, a portin connection with the cylinder, an operating-valve adapted to open and close saidv port, a reguport, a spring, or weighted piston, a cylinder containing the same which is in constant connection with the elevator-cylinder, and con uect-ion between the regulating device and said piston whereby the movement of said piston controls the movement of said regulating device.

32. In a. hydraulic'elevator, in combination, an elevntoucylinder, an inlet from the son rce of water-so pply to the cylinder, an out:- let; from the cylinder, an operating-valve ad opted to open and close said inlet and out-- tion to open the outlet and vice verso. a rcgu- '90 to partially open and close said inletand ontv vice is controlled by the pressure in the cyl- 31.111 ahydmulic elevator, in combinaletting device adapted to vary the size of said let, a regulating device interposed between the cylind r and the inlet and outlet and adapted tovary the size of said inlet and outlet, a spring or weighted piston, a cylinder containing the same which is in constant connection with the elevator-cylinder, and connection between the regulating device and said piston whereby the movement of said piston controls the movement of said regulating device.

38. In a hydraulic elevator, in combination, an elevator-cylinder, a port in connection with the cylinder, an operating-valve adapted to open and close said port, a regulating device adapted to vary the size of said port, a pressure device controlled by the pressure in the elevatorylinder, and connection between the pressure device and the regulating device wherebythe action of the regulating device is controlled by the pressure in the elevator-cylinder, and means independent of the regulating-device'controlling mechanism to control said operating-valve.

34-. In a hydraulic elevator, in combination, an elevator-cylinder, a source of watersupply, an inlet from the source of watersupply to the cylinder, an outlet fromthe cylinder, an operatingrvalve adapted to open and close said inlet and outlet, a regulating device interposed between the cylinder and the inlet and. outlet and adapted to vary the size of said inlet and outlet, a pressure device controlled bythc pressure in the cylinder, and connection between said'pmssurev device and the regulating device whereby the action of the regulating device is controlled by the pressure in the cylinder, and means independentofthe regnlating-device-coutrolling mechanism to control said opernting valve.

35 In a hydraulic elevator, in combination, an elevator-cylinder, a port in connection with the cylinder, an operating-valve adapted to open and close said port, a regulating device adapted to vary the size of said port, a spring or weighted piston, a cylinder containing the same which is in constant connectionv with the elevator-cylinder, and connection Between the regulating device and said piston whereby the movementot' said piston controls the movement of said regulating device, and means independent of the regnlating-device-coutrolling mechanism to control said operating-valve.

36. In a hydraulic elevator, in combination, an elevator-cylinder, an'inlet-port from the source of water-supply to the cylinder, an outlet-port from the cylinder, an operatingvalve adapted to open and close said inlet and outlet ports, a regulating device adapted to vary the size of said inlet and outlet ports, a

springer-weighted piston, a cylindercontaining the same which "s in constant connection with the elevator-cylLnder, and connection between the regulating device and said piston whereby the movement of said piston controls the movement of said regulating device, and

movcment of said shield is controlled by the pressure in the elevator-cylinder.

tion,an elevator-cylinder, a source of watersupply, an inlet from the source of water-supder, a perforated diaphragm interposed between the cyiindcrand said inlet and outlet-,an operating-valve adapted to move along said diaphragm to open and close saidinlet and outlet, a shield adapted in its movements to cover and uncover perforations in said diaphragm, a pressure device directly controlled by the pressure in the elevutor cylinder, and connection between the pressure device and said shield, whereby the movement of said shield is controlled by the pressure in the elevatorcylinder..

39. In a hydraulic elevator, in combination,an elevator-cylinder, a passage in connecon the exterior of the cylinder adapted in its movement to coverand uncover said perforations, an operating-valve adapted to move open and close said passage, a pressure detor-cylinder,and connection between the pressn re device and the shield whereby the action of the shield is controlled by said pressure de-. vice.

t-ion, an elevator-eylinder, a. source of waterply to the cylinder, an outlet from said cylinbetween the elevator-cylinder and the inlet and outlet, a shield on the exterior of the cylinder adapted in its movement to cover and uncover said perforations, an operating-valve adaptedto move back and forth within said and outlet, a pressure device controlled by the pressure in theelevator-cylinder, and con-. nection between the pressure device and the shield whereby the action of the shield is controlled by said pressure device.

41. in a hydraulic elevator, in combination, an elevator-cylinder, a passage inconnection with the cylinder, a cylinder having I perforations interposed in said passage, .1. shield on the exterior of the cylinder adapted 38. In a hydraulic elevator,- in combines tion with said cylinder, a cylinder having perforations interposed in said passage, a shield vice controlled by the pressure in the elevasupply, an inlet from the source of water-sup- .7

cylinder and thus open and close said inlet sure device and said shield, whereby the ply to the cylinder, an outlet from said cylin-v back and forth within said cylinder and thus 40. In a hydraulic elevator, in combina--- I der, a cylinderhaving perforations interposed in its movement to cover and uncover said tor-cylinder,and connection between the pres perforations, an operating-valve adapted to move back and forth within said cylinder and thus open and close said passage, 9. spring or g weighted piston, a. cylinder containing the same which is in direct connection with the eievator -cylinder, and connection between the shield and said piston whereby the movescent of said piston controls the movement t i0 said shield.

42. In a hydraulic elevator, in combinatiers, an elevator-cylinder, a source of watersupoly, an inlet from the source of water-supply to the cylinder, an outlet from said cylindex, a, cylinder having perforations interposed between the elevator-cylinder and the inlet and outlet, a, shield on the exterior of the cylinder adapted in its movement to cover and uncover said perforations, an operatingvalve adapted to move back and forth within said cylinder and thus open and close said inlet and outlet, a spring or weighted piston. a cylinder containing same which is in direct connection with the elevator-cylinder, and

connection between the shield and said piston whereby the movement of said piston controls the movement of said shield.

43. In it hydraulic elevator, in combination, an elevator-cylinder, a port in connection with said cylinder, nu operating-valve adapted by its movement in opposite directions to open and close said port, a regulating iidevice adapted to partially open 'and close -said port, the operating-valve moving in one direction and the regulating-valve in a. different direction to close said port,-a pressure do! vice controlled by the pressure in the elevesurc device and the regulating device whereby the action of the regulating device is con- 0 trolled by the pressure in the elevator-cylinder.

44. In a hydraulic elevator, in c0mbination, an elevator-cylinder, a source of watersupply, an inlet from the source of watersupply to the cylinder, an outlet from the cylinder, a regulating device interposed between the cylinder and the inlet and outlet and adapted to regulate the inlet to and outlet from the cylinder, a pressure device controlled so by the pressure in the cylinder, and connection between said pressure device and the regulating device whereby the action of said last-mentioned device is controlled by the end a speed-governor valve both controlling said port, of manual devices connectedwith said our and operating'said operating-valve, a pressure device controlled by the pressurein the elcvator-cylinde1-,and connection between the pressure device and the speed-governor valve, whereby the action of the letter is controlled by the pressure in the elevator-cylinder.

In test-imonyoi which inventionl havherm unto set my hand.

FRANK E. HERDhlAN. 

